You can get the most Up to Date Liveries from Dropbox here
Remember Installing Liveries is in your SAVED GAMES folder you should never modify your Core DCS Folder, liveries go in (default location) If you only have DCS folder USE THAT FOLDER, You may not have Multiple folders even if you have more then 1 version of DCS installed.
For Stable: C:\users\<your username>\Saved Games\DCS\Liveries
For OpenBeta C:\users\<your username>\Saved Games\DCS.OpenBeta\Liveries
The dropbox is designed so you can drop the folders straight into this directory, if you do NOT HAVE this directory in your DCS Folder, simply MAKE it.